Use a graphing utility to graph the polar equation below.Find the area of the region between the loops of r = 6(1 + 2 sin(𝜃))
Question
Use a graphing utility to graph the polar equation below.
Find the area of the region between the loops of
Solution
To solve this problem, we need to follow these steps:
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Graph the polar equation: First, you need to input the polar equation r = 6(1 + 2 sin(𝜃)) into a graphing utility. This could be a graphing calculator or an online tool like Desmos or GeoGebra. The graph will show a rose curve with 2 loops.
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Identify the region between the loops: The region between the loops is the area enclosed by the two loops of the rose curve. This is the area we want to find.
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Find the area of the region: To find the area of the region between the loops, we need to integrate the square of the radius function over the interval that corresponds to the loops. The area A of a polar curve defined by r(𝜃) from 𝜃=a to 𝜃=b is given by the formula A = 1/2 ∫ from a to b [r(𝜃)]² d𝜃.
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For the given polar equation, the radius function is r(𝜃) = 6(1 + 2 sin(𝜃)). The loops occur when 𝜃 ranges from 0 to π (for the upper loop) and from π to 2π (for the lower loop). So, we need to compute the integral A = 1/2 ∫ from 0 to 2π [r(𝜃)]² d𝜃.
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Compute the integral: This step requires knowledge of calculus, specifically integration techniques. You can use a calculator or an online tool to compute the integral.
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Multiply the result by 1/2: The final step is to multiply the result of the integral by 1/2 to get the area of the region between the loops.
Remember, the exact steps might vary depending on the specific graphing utility you are using.
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